<!--
 * @Descripttion: 图像裁剪组件
 * @version: 1.0
 * @Author: sakuya
 * @Date: 2021年7月24日17:05:43
 * @LastEditors:
 * @LastEditTime:
 * @other: 代码完全开源，欢迎参考，也欢迎PR
-->

<template>
  <div class="sc-cropper">
    <div class="sc-cropper__img">
      <img ref="img" :src="src">
    </div>
    <div class="sc-cropper__preview">
      <h4>图像预览</h4>
      <div ref="preview" class="sc-cropper__preview__img" />
    </div>
  </div>
</template>

<script>
import Cropper from 'cropperjs'
import 'cropperjs/dist/cropper.css'

export default {
  props: {
    src: { type: String, default: '' },
    compress: { type: Number, default: 1 },
    aspectRatio: { type: Number, default: NaN },
  },
  data () {
    return {
      crop: null,
    }
  },
  watch: {
    aspectRatio (val) {
      this.crop.setAspectRatio(val)
    },
  },
  mounted () {
    this.init()
  },
  methods: {
    init () {
      this.crop = new Cropper(this.$refs.img, {
        viewMode: 2,
        dragMode: 'move',
        responsive: false,
        aspectRatio: this.aspectRatio,
        preview: this.$refs.preview,
      })
    },
    setAspectRatio (aspectRatio) {
      this.crop.setAspectRatio(aspectRatio)
    },
    getCropData (cb, type = 'image/jpeg') {
      cb(this.crop.getCroppedCanvas().toDataURL(type, this.compress))
    },
    getCropBlob (cb, type = 'image/jpeg') {
      this.crop.getCroppedCanvas().toBlob((blob) => {
        cb(blob)
      }, type, this.compress)
    },
    getCropFile (cb, fileName = 'fileName.jpg', type = 'image/jpeg') {
      this.crop.getCroppedCanvas().toBlob((blob) => {
        const file = new File([blob], fileName, { type })
        cb(file)
      }, type, this.compress)
    },
  },
}
</script>

<style scoped>
  .sc-cropper {height:300px;}
  .sc-cropper__img {height:100%;width:400px;float: left;background: #EBEEF5;}
  .sc-cropper__img img {display: none;}
  .sc-cropper__preview {width: 120px;margin-left: 20px;float: left;}
  .sc-cropper__preview h4 {font-weight: normal;font-size: 12px;color: #999;margin-bottom: 20px;}
  .sc-cropper__preview__img {overflow: hidden;width: 120px;height: 120px;border: 1px solid #ebeef5;}
</style>
